Here is a log for the 4.1 flash update:
While it appears to have successfully updated, Is there a problem with not finding a bootloader?
coa: sE+6FYKtmie9PKuuthLMYgyI1aVu/MU0I3zvehktY3QMK+eDHq+cpn5rAfcyS8aBd3bkoNTLLIGe7FNFmZA4jGKJIRlpy+2EkJYB40XbtVIcYZwyf6U7h5784K8LTjqwSMbTxoOe0lUP5zHdft+wQwVUNY/tbfQfl+D+HiGIGtI=
sn: 003a002c3133471831383530
Chip:
[unavailable; bootloader too old]
Info:
flash size: 2080768
board_type: 9 (fmuv3)
board_rev: 0
Identification complete
Erase : [====================] 100.0%
Program: [====================] 100.0%
Verify : [====================] 100.0%
Rebooting.
Waiting to restart mavproxy…
Restarting mavproxy
Complete!